Using Rust, Dust or Dirt is a good way to blend two different materials and objects together. We can achieve this by using the Ambient Occlusion node, both in Cycles and Eevee. Follow Blender Secrets on Youtube https://www.youtube.com/c/BlenderSecrets Free Sample PDF https://mailchimp.blendersecrets.org/freesample Full Blender e-book with free updates https://blendersecrets.gumroad.com/l/IxofeY https://blendermarket.com/products/blender-secrets | Blender Secrets